Georgia Power officials say the initial phase of the plant went online March 25, 2011, and is now at a capacity of about 350 kilowatts.
The company said in a statement that construction on the second phase is expected to begin by the end of January and become operational by late March.
The first two phases will consist of more than 3,100 fixed-tilt solar panels and will provide a combined capacity of about 700 kilowatts.
The plant is being developed and constructed by United Renewable Energy LLC. The project is designed for three phases and up to one megawatt of capacity.